Stealing the show: LeAnn arrives on the red carpet before her performance

'I love this girl so much, she is such an amazing talent,' said a smiling LeAnn.

And Carly Rose called the song 'one of the most fun moments I have had on stage.'

Fun might have been an understatement, as LeAnn was constantly trying to out perform the young contestant, making a concerted effort to sing bigger notes and steal camera time.

Bigger star: LeAnn was constantly trying to out perform the young contestant

Wild woman: LeAnn ended the wild performance by grabbing Carly's arm and throwing her hair in her face

The country singer, whose public affair with now husband Eddie Cibrian has caused her great personal strife, was also rocking around on the stage, constantly playing with her hair.

LeAnn, who previously said she would love to be a judge on the show, ended the wild performance by grabbing Carly's arm and throwing her hair in her face.

'They were shockingly amazing, so great' said Britney, who appeared to be in tears during the performace.

Me first: The country singer also threw her hair in the 13-year-old's face

Who's competing here? LeAnn has stated in the past that she would like to be judge on the show

The second round of the final saw the contestants team up with a chart star to perform one of their hit songs.

Earlier in the show the young schoolgirl had a chance to show off her pipes solo, kicking off the final singing Nina
Simone's 'Feeling Good.'

'I want this so badly as I have put so
much of my heart and soul into it. I have wanted this ever since I
could remember, ever since I began singing at two-years-old. I can't let
it slip away from me now,' said Carly Rose.

Shining solo: The teen opened the show with Nina Simone's Feeling Good

Final plea: Carly was joined by hosts Mario Lopez and Khloe Kardashian as she pleaded for votes

A little fun: The pint sized star played around with Mario Lopez

The four judges were all thrilled with Carly Rose.

'Well you are here to try and win this tonight, aren't you? I can tell,' said Simon.

'The first time I heard that it blew
me away, none of us believed you were 13 and I still don't. Actually you
sang it better tonight than you did the first time. I like your
competitive spirit.'

Her mentor Britney completed the praise by telling the youngster: 'We are going to win this.'